The economic confidence index, which includes evaluations, expectations and tendencies of consumers and producers regarding Turkey's economy, increased by 13 percent in October, according to the Turkish Statistics Institute (TurkStat) statement released on Tuesday.Consumers have enjoyed a bout of robust pre-election spending, credit agency Standard & Poor's wrote in a note published on Oct. 8. Standard & Poor's economists have revised their GDP growth forecast for Turkey upward to 3.1 percent from 3 percent for 2015.The index rose by 13 percent compared to September and reached 81.48. Nonetheless, as the index stands below 100 points, it continues to reflect a pessimistic outlook on the economy.Among the components of the index, the consumer confidence index rose by 7.3 percent to 62.78 in October, while the real sector confidence index increased by 3.7 percent and retail trade confidence index increased by 2.7 percent. Services confidence index slightly rose by 0.1 percent, while the construction confidence index slightly dropped by 0.5 percent.Driven largely by domestic consumption, Turkey's economy grew at the rate of 3.8 percent in the second quarter of 2015, according to a statement released by TurkStat on Sept. 10. The Turkish economy's high growth rate is largely due to strong domestic demand and private sector investment, the statement said. Turkey is holding a snap election on Sunday after coalition talks failed following an inconclusive election in June.